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Plan Asset and Target Asset Allocations (Detail) | Dec. 30, 2017 | Dec. 31, 2016
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Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Percentage of Plan Assets at the Measurement Date |  | 100.00% | 100.00%
Equity Securities |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Percentage of Plan Assets at the Measurement Date |  | 38.60% | 51.10%
Equity Securities | Minimum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2018 |  | 15.00% |
Equity Securities | Maximum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2018 |  | 45.00% |
Fixed Income Securities |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Percentage of Plan Assets at the Measurement Date |  | 27.10% | 9.30%
Fixed Income Securities | Minimum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2018 |  | 25.00% |
Fixed Income Securities | Maximum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2018 |  | 45.00% |
Real Estate Funds |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Percentage of Plan Assets at the Measurement Date |  |  | 5.20%
Other Diversifying Strategies |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Percentage of Plan Assets at the Measurement Date | [1] | 28.80% | 33.50%
Other Diversifying Strategies | Minimum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2018 | [1] | 0.00% |
Other Diversifying Strategies | Maximum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2018 | [1] | 40.00% |
Short Term Investments And Cash |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Percentage of Plan Assets at the Measurement Date |  | 5.50% | 0.90%
Short Term Investments And Cash | Minimum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2018 |  | 0.00% |
Short Term Investments And Cash | Maximum |  |  |
Schedule Of Defined Benefit Plan Asset Allocation Targets [Line Items] |  |  |
Target Allocation 2018 |  | 10.00% |
[1] | Includes absolute return funds, hedged equity funds, and guaranteed insurance contracts.

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- Definition Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] + References No definition available. + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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